Not verified personally but looking around online, those 20"s weigh 48lbs each. The raptor 17"s weigh 34lbs each. The 285/55/r20 KO2 weighs 51lbs each, according to tire rack. The 315/70/r17 weighs 65lbs each. These are the "c" load rated OEM tires. For those of you doing the math at home, wheel plus tire for the 17"s is 99lbs. For the 20"s... 99lbs. Now, I do a pretty balanced amount of city and highway driving. Per mile, the 20"s rotate about 624 times. The 17"s, about 587. In theory then, the 35" tires should give more favorable highway mileage and less favorable city mileage. For my particular usage, that has resulted in about a 0.5mpg improvement. YMMV.